Re: [PATCH 1/1] perf util: fix perf_exe() buffer write past end

[Arnaldo Carvalho de Melo]

On Tue, May 26, 2026 at 08:05:44AM -0700, Ian Rogers wrote:
> On Tue, May 26, 2026 at 4:10 AM Miguel Martín Gil
> <miguel.martin.gil.uni@xxxxxxxxx> wrote:
> >
> > perf_exe() passes len to readlink() and then unconditionally writes a trailing NUL at buf[n]. If readlink() returns len, the write lands one byte past the buffer.
> >
> > Read at most len - 1 bytes and keep the existing NUL termination. Also guard the fallback path for tiny buffers so copying "perf" cannot overflow.
> >
> > Signed-off-by: Miguel Martín Gil <miguel.martin.gil.uni@xxxxxxxxx>
> 
> Reviewed-by: Ian Rogers <irogers@xxxxxxxxxx>
> 
> and Sashiko is green:
> https://sashiko.dev/#/patchset/20260526110852.7259-2-miguel.martin.gil.uni%40gmail.com

Thanks, applied to perf-tools-next, for v7.2.

- Arnaldo